spec: duplicate keyword args f(x=1, x=2) is a static error (#133)
spec: duplicate keyword args f(x=1, x=2) is a static error (#133)

This wording comes from https://github.com/google/starlark-go/commit/2c65f9e0f5e155edb22bcf767d709321069553e9

Fixes #21

bazelbuild/starlark,bazelbuild/starlark